Mixing apparatus



March 16, 1943. "J, N, SELVG 2,314,166

Mr xING ApgARATus Filed July 29, 1941 2 FIG. l

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A Tro'RA/Er Patented Mar. 16, 1943 MIXING APPARATUS John N. Selvig, Westeld, N.

ern Electric Company,

J., assignor to West- Incorporated, New

York, N. Y., a corporation of New York Application July 29, 1941, Serial No. 404,528

8 Claims.

This invention relates to mixing apparatus, and more particularly to apparatus for mixing continuously owing liquids in predetermined proportions.

There are innumerable instances in industry where continuously owing liquids are to be :mixed to produce a continuous flow of adjustably variable, normally constant ratio of two component liquids.

An Object of the present invention is to provide apparatus which shall be effective to intermingle two, inflowing fluids in accurately predetermined ratio and in which the ratio may be adjusted to have any value within a wide range.

With the above and other objects in view, the invention may be embodied in an apparatus for mixing iluids and comprising means to contain a body of one ud and having an effluent outlet, means to project another uid across the entrance of the outlet to interfere with flow of the first named fluid to and through the outlet, and means to adjustably vary the etfectiveness of the projected second named iluid to interfere with the flow of the lirst named fluid.

Other objects and features will appear from the following detailed description of one embodiment of the invention taken in connection .with the accompanying drawing in which the same reference numerals are applied to identical partsin the several figures and in which Fig. l is a diagrammatic View in front elevation of an apparatus constructed in accordance with the invention;

Fig. 2 is a left side elevation of the showing of Fig. 1;

Fig. 3 is an enlarged sectional view on the line 3-3 of Fig. 2;

Fig. 4 is a view similar to Fig. 3 of a modified form; and

Fig, 5 is a view similar to Fig. 1 of another form.

As herein disclosed the invention is illustrated as embodied in an apparatus for mixing a liquid suspension of 1.25% beaten paper pulp in water with plain water to produce an eluent carrying any desired predetermined percentage of pulp from none at all to the full 1.25%.

The mixing device proper, bestshown in Fig.

3, vcomprises a combined tank and housing Ill, -vhere shown for simplicity -as open and uncovered at the top although it may well have a lid or be otherwise closed. 'Ihe main, upper part oi thev tank chamber may be rectangular and uniform in cross-section, while the lower part tapers downwardly, preferably by breaking the rear wall forward as shown, to an outlet aperture I6 in the forward part of the bottom, the front wall being vertical throughout.

A generally cylindrical control member or valve VII is housed in a corresponding bore or recess in the body of the tank under and intersecting the forwardly sloping part of the rear wall. The cylinder II is segmentally cut away, as shown in Fig. 3, so that in the position of the parts there shown, the segment face and the forwardly sloping wall form one coplanar sloping oor nearly across the chamber of the tank. The cylinder is so positioned, however, that a small gap I5 is left between the forward face or wall of the chamber, substantially across its entire width. The cylinder is formed with an axial bore I9 closed at the right by a plug 26 and open at the leit to communicate with a supply pipe 20. A horizontal slot 25 opens from the bore I9 through the front surface of the cylinder at the lower edge of the segmental at on the cylinder. Means is provided, e. g. a lever l2, to rotate the cylinder in its housing about its axis. Below the gap I5 an arc of the cylinder surface is left bare between the gap and a slot closing edge 2'I of the body of the housing Ill formed just above the eilluent outlet I8.

A fixed inlet pipe II connected to a source (not shown) of pulp liquor serves to bring pulp liquor into the tank at a point conveniently above the cylinder II. A xed overflow pipe I8 serves to maintain the liquid level in the tank substantially constant in order to maintain the head pressure substantially constant at the gap I5.

The water supply pipe 20 communicating at one end with the bore I9, communicates at the other end. with the bottom of `a water supply tank 2|, vertically slidable on a guide 23v and adjustable as to height thereon by a screw 22. The tank 2l is lled continuously, when in operation, with water from a source not shown, via a supply pipe 23. A constant level in the tank 2l is maintained by an overflow outlet 24.

In operation, with the parts in the position shown, there is a continuous ilow of water under constant pressure from the tank 2l via the tube 2li and bore I9 which emerges from the slot 25 as a horizontal sheet across the gap I5 over the entire length of the gap. Above this sheet of water, the chamber of the tank I0 is filled with pulp liquor under constant head.. If the parts be properly proportioned and the head of the water in the bore I9 be sufficiently great, the sheet of water across the gap I forms a floor substantially impervious to the pulp liquor above it. Parenthetically, it may be necessary in some instances to turn the cylinder EI a trie backward (counterclockwise in Fig. 3), thus directing the water sheet from the slot 25 a trie upwardly, to achieve this extreme result. In such status, only water will emerge from the eiiluent outlet IE.

Now, by rotating the lever I2 and hence the cylinder II slowly forward (clockwise in Fig. 3), the sheet of water across the gap I5 is tilted more and more downwardly and becomes increasingly less efficient to close the gap I5. Pulp liquor from above begins increasingly to enter and flow down through the gap and is thoroughly mingled with the water in the enlarged space under the forward portion of the cylinder, by turbulence there, before passing out through the effluent outlet I 6.

The volume of water passing through is undiminished and a greater and greater proportion of pulp liquor is mixed with it until the lower edge of the slot 25 coincides with the slot closure edge 2 of the housing. Continued rotation of the cylinder then gradually shuts the slot 25 and diminishes the flow of water into the mixture until no water flows and only pulp liquor runs out of the effluent outlet I6.

Hence by giving the cylinder I I a suitable angular position it is possible to produce from the outlet I6 any liquid desired from water only through any proportion of water and pulp liquor to pulp liquor only. And, evidently, the same can be done in like fashion with almost any two liquids.

While in general it is believed to be preferable to form the cylinder I I with the flat surface shown in Fig. 3, in the case of some liquids, especially where no solid suspension is present, it may be preferred to leave the cylinder entire as in Fig. 4.

The forms of embodiment disclosed in Figs. l, 2, 3 and 4 are particularly adapted for use in mixing two liquid fluids in any desired ratio. In Fig. 5 is shown a modied form of the apparatus embodying the invention and particularly adapted for use in mixing two gaseous fluids in any desired ratio. In this instance one of the gases to be mixed is fed to the bore of the adjustable cylinder I i by a pipe |26 from some suitable means of storage under controllable pressure, e. g. a gasometer I2I with removable weights E29. The tank or housing II is closed at the top and the other gas to be mixed is supplied under controllable pressure, e. g. from a gasometer 22| withY weights 229. There is nothing here to correspond to the overflow IS in Fig. 3. In structure and operation the arrangement of Fig. 4 is otherwise substantially identical with those of the apparatus of Fig. 3.

The embodiment herein disclosed is illustrative and may be variously modified and departed from without departing from the spirit and scope of the invention as pointed out in and limited only by the appended claims.

What is claimed is:

1. Apparatus for mixing uids and comprising means to contain a body of one fluid and having an effluent outlet sufficiently below the top of such body of contained fluid to create a head in the fluid tending to cause the same to flow out through the outlet, means to project another fluid across the entrance of the outlet to interfere with flow of the first named fluid to and through the outlet, and means to adjustably vary' the direction of projection of the second named fluid to vary the effectiveness of the projected second named fluid to interfere with the ow of the first named fluid.

2. Apparatus for mixing liquids and comprising a tank to contain a body of one liquid and having an effluent outlet in the bottom thereof, means to project another liquid across the entrance of the outlet to interfere with flow of the rst named liquid to and through the outlet, and means to adjustably vary the direction of projection of the second named liquid to vary the effectiveness of the projected second named liquid to interfere with the flow of the first named liquid.

3. Apparatus for mixing fluids and comprising a tank having a receiving chamber to contain a fluid and formed with an outlet, a hollow member positioned adjacent to the outlet and formed with an aperture from the space within the member through a wall thereof, means to supply a second fluid to the interior of the member to be projected through the aperture thereof into the chamber in the tank, and means to vary the position of the member to vary the direction of projection of the second fluid into the chamber, the parts being so proportioned and arranged that in one position of the member the lluidf'projected from the aperture thereof will substantially prevent access of the fluid in the .chamber to the outlet while in other positions of the member such effect of fluid projected therefrom is diminished.

4. Apparatus for .mixing fluids and comprising a tank have a receiving chamber to contain a fluid and formed with an outlet, means to maintain fluid therein under substantially constant pressure in the neighborhood of the outlet, a hollow member positioned adjacent to the outlet and formed with an aperture from the space within the member through a wall thereof, means to supply a second fluid under adjustably constant pressure to the interior of the member to be projected through the aperture thereof into the chamber in the tank, and means to vary the position of the member to vary the direction of projection of the second fluid into the chamber, the parts being so proportioned and arranged that in one position of the member thefluid projected from the aperture thereof will substantially prevent access of the fluid in the chamber to the outlet while in other positions of the member such effect of fluid projected therefrom is diminished.

5. Apparatus for mixing liquids and comprising a tank to contain a liquid and having a liquid inlet and a constant level overflow in the upper portion thereof and an effluent outlet in the bottom thereof, a hollow cylindrical member positioned adjacent to the outlet and formed with a longitudinal slot through one wall communicating with the interior of the tank above the outlet, and means to adjust the cylinder about its axis to vary the radial direction of the slot, the parts being so proportioned and arranged that if the tank be filled with one liquid and another liquid supplied to the interior of the member be projected through the slot thereof in a sheet, said sheet of liquid in one position of the cylinder will interfere to a maximum degree with elllux of the first named liquid through the outlet and in other positionsv of the cylinder will interfere in lesser degree.

6. Apparatus for mixing liquids and comprising a tank to contain a liquid and having a liquid -inlet and a constant level overflow in the upper portion thereof and an effluent outlet in the bottom thereof, means to supply a liquid to the inlet, a hollow cylindrical member positioned adjacent to the outlet and formed with a longitudinal slot through one wall communicating with the interior of the tank above the outlet, means to supply a second liquid under adjustably constant pressure to the inside of the cylinder, and means to adjust the cylinder about its axis to vary the radial direction of the slot, the parts being so proportioned and arranged that if the tank be filled with one Vliquid and another liquid supplied to the interior of the member be projected through the slot thereof in a sheet, said sheet of liquid in one position of the cylinder will interfere to a maximum degree with efflux of the first named liquid through the outlet and in other positions of the cylinder will interfere in lesser degree.

7. Apparatus for mixing liquids and comprising a tank to contain a liquid and having a liquid inlet and a constant level overflow in the upper portion thereof and an eiiiuent outlet in the bottom thereof, a hollow cylindrical member par-V tially housed in one side wall of the tank and extending across to define a narrow gap between the cylinder and the opposite Wall of the tank above the outlet and the cylinder having a longitudinal slot through the wall thereof, and means to adjust the cylinder about its axis to vary the radial direction of the slot, the parts being so proportioned and arranged that if the tank be filled with one liquid and another liquid supplied to the interior of the member be projected through the slot thereof in a sheet, said sheet of liquid in one position of the cylinder will interfere to a maximum degree with efflux of the rst named liquid through the outlet and in other positions of the cylinder will interfere in lesser degree.

,8. Apparatus for mixing liquids and comprising a tank to contain a liquid and having a liquid inlet and a constant level overflow in the upper portion thereof and an effluent outlet in the bottom thereof, means to supply a liquid to the inlet, a hollow cylindrical member partially housed in one side Wall of the tank and extending across to define a narrow gap between the cylinder and the opposite Wall of the tank above the outlet and the cylinder having a longitudinal slot through the wall thereof, means to supply a second liquid under adjustably constant pressure to the inside of the cylinder, and means to adjust the cylinder about its axis to vary the radial direction of the slot, the parts being so proportioned and arranged that if the tank be lled with one liquid and another liquid supplied to the interior of the member be projected through the slot thereof in a sheet, said sheet of liquid in one position of the cylinder will interfere to a maximum degree with efflux of the rst named liquid through the outlet and in other positions of the cylinder will interfere in lesser degree.

JOHN N. SELVIG. 

